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Flu activity highest among U.S. young and middle-aged: CDCBy David Beasley ATLANTA (Reuters) - Hardest hit this U.S. flu season are adults, from younger to middle-aged, in part because fewer have been vaccinated, a federal health agency said on Thursday as the season enters its final weeks. An estimated ...

Mystery surrounds how ex-Russian spy was poisoned in UKLONDON (AP) -- As British authorities investigate the poisoning of a former Russian spy and his daughter in England, there is much mystery about how exactly the brazen attack was carried out. Here are some of the unanswered questions that British officials are chasing:...